Make mosaics/collages of b&w photos (reprinted of course) and adhere with PVA glue. Cover the whole surface over the new pic with PVA as well. Leave to dry and repeat. Re-paint the whole thing again with glue (waiting for it to dry between each coat) 5-6 times if I recall correctly and it will be glossy, spill proof and sentimental decoupage.
If the pics you use have a rough, torn white edge it will look even better, imho :).
Have fun with it :)
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